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Posted to dev@orc.apache.org by "Ion Gaztañaga (Jira)" <ji...@apache.org> on 2020/06/06 21:57:00 UTC

[jira] [Created] (ORC-639) Improve zstd compression performance

Ion Gaztañaga created ORC-639:
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             Summary: Improve zstd compression performance
                 Key: ORC-639
                 URL: https://issues.apache.org/jira/browse/ORC-639
             Project: ORC
          Issue Type: Bug
          Components: C++, compression
    Affects Versions: 1.6.3
            Reporter: Ion Gaztañaga


In Compression.cc, classes ZSTDCompressionStream and ZSTDDecompressionStream employ Zstd's "Simple API", which initializes the compression/decompression context each time. This context initialization includes time to initialize all compression/decompression tables.

 

Using the "Explicit context" API improves the performance significantly as compression/decompression tables are constructed once and reused each time "decompress" or "doBlockCompression" is called.

We've noticed more than 15% time improvement in some applications with this change, so it seems that any ORC user using Zstd can benefit from this change.



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